40=7b-9b

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Solution for 40=7b-9b equation:


Simplifying
40 = 7b + -9b

Combine like terms: 7b + -9b = -2b
40 = -2b

Solving
40 = -2b

Solving for variable 'b'.

Move all terms containing b to the left, all other terms to the right.

Add '2b' to each side of the equation.
40 + 2b = -2b + 2b

Combine like terms: -2b + 2b = 0
40 + 2b = 0

Add '-40' to each side of the equation.
40 + -40 + 2b = 0 + -40

Combine like terms: 40 + -40 = 0
0 + 2b = 0 + -40
2b = 0 + -40

Combine like terms: 0 + -40 = -40
2b = -40

Divide each side by '2'.
b = -20

Simplifying
b = -20

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